Sensorless induction motor parameter identification and control

In this paper, a sensorless induction motor parameter identification is presented. Sensorless control employs a variety of estimators and observers of motor speed, torque and fluxes, and accurate information about motor parameters is crucial to obtain a high performance control. The parameters of the induction motor equivalent circuit are obtained by means of DC an AC tests using the voltage-source inverter. When these parameters are estimated a closed loop flux estimator and an open loop speed estimator are implemented to determine the mechanical parameters of the machine. The parameter estimation procedure has been simulated and tested in a 7.5 kW induction motor. With the obtained parameters a sensorless control was implemented.